Demolition at Xcel Energy Arapaho
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Arapahoe Decommissioning Project

SCOPE OF WORK:

  • Mobilize and demobilize labor, equipment, materials, and temporary facilities.
  • Control surface water and groundwater as necessary for the work per the SWMP.
  • Conduct thorough pre-demolition asbestos and hazardous materials surveys.
  • Furnish and install a security fence and gates as required.
  • All asbestos insulation and other materials abatement
  • Lead paint abatement as required for demolition activities
  • All plant structures demolition.
  • Outbuildings demolition including warehouses, shops, storage buildings, etc.
  • Building and equipment foundations removal, three feet below grade.
  • Circulating water tunnel removal.
  • All underground pipe larger than 4″ above ten feet below grade, electrical duct bank and cables, and other utility removals.
  • Site water well structure and piping demolition
  • Coal conveyor demolition.
  • Scrap material salvage.
  • All other chemicals, oil, etc. storage vessels shall be emptied and disposed of.
  • Environmental monitoring.
  • Removal of two (2) concrete stacks using conventional methods
  • Properly transport, store, treat, recycle, and reuse or dispose of all waste materials generated by the work.
  • Drain oil-filled equipment (No PCB’s present)
  • Removal of all universal waste (lamps, ballasts, bulbs, etc.)
  • Cleaning, decommissioning, and removal of tanks and associated appurtenances.
  • Impacted soil excavation if encountered during work activities.
  • Site cleanup & demobilization
  • Removed & crushed approximately 40,000 cubic yards of concrete.

ADDITIONAL PROJECT FEATURES:

Site: The Arapahoe site consists of 4 units. Units 1, 2, & 3 are 50 megawatts each & Unit 4 is 100 megawatts. There were 2 smokestacks, each 250′ tall. Approximately 40 outbuildings housed miscellaneous plant equipment, controls, workshops, etc.

Exterior: Available to wreck from 3 sides of the plant. Open surroundings. No major obstructions to prevent access during the course of demolition. The substation was located approximately 70′ behind the plant. NADC maintained boundaries between work areas & the active substation.

Interior: Turbines located on level 2. Condensers located at ground level. No basement. All 4 boilers were low pressure. Unites 1-3 consisted of a precipitator, boiler, & main plant section. The main plant sections were comprised of pulverizers, motors, coal hoppers and piping. The total abatement was performed throughout. Unit 4 was a baghouse, boiler, & main plant. The baghouse was added on & did not require the same amount of abatement as the precipitators. NADC made the necessary cuts and tripped the building using cables and appropriate rigging. Unit 4 Boiler was brought fully to the ground with no incidences.

SAFETY GOALS ACCOMPLISHED:

No recordable incidents by NADC. Consistently referred to as “the safest project Xcel has going” by Xcel Management Team.

 

Contact us for more detailed information on your
total demolition project.

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Praxair Carneys Point Hydrogen Plant

Demolish Praxair site to grade and all associated equipment at Praxair’s Carneys Point, NJ facility, located at DuPont.

Summary of Major Structures NADC removed:

  • Tanks and receivers
  • Electrical building
  • Air Separation Columns
  • Compressors and Turbines
  • Cooling Tower
  • Water Treatment Equipment and Building
  • Office buildings
  • Interconnecting piping, miscellaneous piping, valves, wiring, and instrumentation within site perimeter.

NADC final graded the site with 21AA.

SAFETY GOALS ACCOMPLISHED:
NADC completed this project utilizing a full-time safety Engineer whose role and responsibilities included working with NADC and our subcontractors to provide safety oversight on all work tasks associated with this project.

Praxair Carney’s Point Demolition Project completed with:

  • Zero (0) damage to adjacent buildings or property.
  • Zero (0) Near miss incidents related to NADC personal, County or subcontractors.
  • Zero (0) recordable injuries
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Las Vegas Club Demolition

This project included complete removal of all structures to the back of curbs surrounded by Fremont, 1st, Ogden, and Main Streets. All structures were removed completely to their foundations and the North Tower basement was backfilled with crushed concrete from the demolition and compacted to 98% of proctor.

The first structures to be removed were the lower one and two-story structures including Granite Gaming, Mermaids, Golden Goose/Glitter Gulch, the Power House, and Low Roof Annex sections of the Towers. The Power House and Mermaids had basements. Next, the casinos were taken down. The old casino section had a basement as well and while backfill was not required, we graded these areas for easy movement around the site. We needed to build a workbench for the high reach equipment to access the towers, so the concrete parking structure came next. As the structure came down, the materials were segregated and sized for use in constructing the workbench.

The concrete south tower was demolished and the materials were segregated and sized to make a 35′ high workbench for accessing the north tower. This structure was a steel-framed, staggered truss system that allowed 80′ spans column to column in the N-S axis. The tower was 80′ across, 145′ long and 200′ in elevation. The high reach equipment began by removing the roof, penthouse, and four stories of floors between the column lines. Once exposed, a crane was used with a man basket to carry workers to planned elevations for torch cutting and felling. This process continued from East to West, bay by bay, until the stairwell at the West end was reached. The West end was felled in four separate felling events utilizing torch cuts and pull cables.

SAFETY GOALS ACCOMPLISHED: This project was completed without injury.

SPECIAL ACHIEVEMENTS: The North Tower with its steel frame and staggered truss system was a special challenge. the work plan was carried out flawlessly and safely.

ADDITIONAL COMMENTS: Dust control was a very important part of our work in Las Vegas due to being surrounded on all sides by a bustling crowd. The Clark County Department of Air Quality visited the project on several occasions. They were always complimentary of our efforts to control dust and did not issue a single warning or citation.

 

Contact us for more detailed information on your
total demolition project.

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Salt Conveyor and Enclosure Demolition

The project involved the removal of old salt conveyors at a Cargill salt plant in Hersey, Michigan. The conveyors carried bags of salt overhead from the salt plant to an igloo type storage structure. The bags were then lowered down from an opening in the roof of the igloo to the floor of the igloo. Once inside the igloo the salt bags were loaded onto pallets, strapped down and stacked for eventual loading onto flatbed trailers for delivery to customers.

NADC’s portion of the project involved removing the salt conveyor and salt conveyor enclosure from the slat plant to the igloo. After completing an engineered lift plan seven picks were made including the salt conveyor/conveyor enclosure (2 picks), conveyor support legs (2 picks), steel house structure on top of the igloo (2 picks) and a small section of conveyor inside the opening to the salt plant (1 pick). Once the picks were complete the conveyors and other steel structures were cut up with a shear for recycling. The concrete piers under the conveyor’s legs were hammered down to grade with a concrete hammer on a NADC Bobcat. All the items to be picked were pre-cut by men in manlifts using torches. Once the crane was connected to each section the balance of the steel was cut to allow the crane to lower the pieces to the ground for further processing. The job was completed in six days.

 

Contact us for more detailed information on your
total demolition project.